Understanding UV400: The Critical Standard for True Eye Protection
Oct 26, 2025
Every pair of sunglasses is a promise of protection, but if you don't understand the technical standard, that promise may be hollow. UV400 is the critical designation you need to see, representing the peak of protective Performance & Power. It means the lens blocks light rays with wavelengths up to 400 nanometers, which effectively covers 99.9% of both UVA and UVB rays. The danger from the sun is invisible, but the consequences—from cataracts to corneal damage—are real. At BLANK, UV400 protection is non-negotiable across our entire line. This technical detail is the single most important component of your eyewear, ensuring that while you look sharp, your eyes are shielded by the highest level of optical defense available.
It is crucial to understand that lens color or darkness has no bearing on UV protection. A very dark lens without the UV400 certification is actually more dangerous than no lens at all. The dark tint causes your pupils to dilate, allowing more harmful UV radiation to enter the eye since the protective filter is absent. Always look for the explicit UV400 or "100% UV Protection" sticker or marking on the frame or packaging. This certification guarantees that the technical Performance of the material is shielding your eyes, regardless of whether the lens is a light amber tint or a deep slate grey.